Hi,all I am trying to simulate electric field of multi-electron, suppose the electric field formula: E = KQ/r^2 (Both 'K'and 'Q' are const value, 'r' reprents the distance off the electron) , how to compute isosurface of multi-electrons if given the specified value of "E"? any help? thank you advance!!!:) 6dgis 6dgis at 163.com 2005-07-28